In the last century while in the service, blind was another word for a dud or something that failed to detonate. You didn't hear it used very much, usually by the old demolition guys. One of them told me that they called them blind because they didn't explode among the enemy so now they were blind to what side was near them and they could explode and kill the good along with the bad. He probably made it up, but it sounded pretty good to a young kid. Don't know if the same meaning was used during the CW, "a shell that would not explode".
Dan